Transport properties and atomic structure of ion-beam-deposited W, Pd and Pt nanostructures

Abstract

We investigate the atomic structure and transport properties as a function of temperature (T) and applied magnetic field (H) of ion-beam-induced deposition (IBID) of tungsten, palladium and platinum micrometer and nanometer sized thin films and wires. The samples show a non-metallic behavior due to the low metallic content. Electron diffraction at room temperature reveals that the samples are amorphous (W, Pt) and polycrystalline (Pd). The temperature and magnetic field dependence of the samples reveal a behavior similar to that found in disordered or granular conductors. The resistivity rho decreases with T following a function of the type rho(T) = a-bT(alpha)+cT(-beta) (alpha,beta > or = 0) and the magnetoresistance of all samples shows a scaling of the form [rho(H,T)-rho(0,T)]/rho(0,T) = f(H/C(T)), with a temperature-and sample-dependent parameter C(T).

Palladium-Based Nanomaterials: Synthesis and Electrochemical Applications

“…Pd and Pd-based nanomaterials synthesized by this technique include nanoscale films, nanoparticles, nanowires, and nanorods. This broad range of fabrication techniques includes sputtering, − ion or electron beam deposition, ,− and laser ablation. − …”

“…Ion- and electron-beam-induced deposition (IBID and EBID) methods are attractive for their unique ability to fabricate three-dimensional structures in a single step. Both IBID and EBID allow for morphologies, dimensions, and interparticle distances to be tailored by high-energy focused beams, ions, and electrons, respectively. ,, They are both vacuum-based techniques, and their deposition processes are fairly similar, as illustrated in Figure . The precursor materials are introduced via an injection system, allowing them to be adsorbed onto the substrate.…”

“…A focused beam then stimulates the decomposition of the precursor materials to produce the desired nanostructures. Barzola-Quiquia et al 55 employed IBID (FEI NanoLab XT 200 dual-beam microscope (DBM)) to synthesize Pd-based nanowires that exhibited nonmetallic behavior due to their low metallic content, where palladium bis(hexafluoroacetylacetonate) was used as the precursor. The synthesis conditions included an operating energy of 30 kV, a Ga + ion beam, a 10 pA current, and a precursor temperature of 36 °C.…”

Influence of rhombohedral stacking order in the electrical resistance of bulk and mesoscopic graphite

“…The negative sign of R 1 is not expected if electron-phonon interaction would play a role. However, such a negative, nearly linear in T term in R(T ) especially at low temperatures, has been observed in nano-Ag grains [64] as well as in ion-beam-deposited W, Pd and Pt nanostructures [65]. Its origin appears to be induced by interfaces with very low order or disordered structures at the interfaces between the Ag, PdC, WC and PtC nanograins.…”

Current–voltage characteristics of focused ion beam fabricated superconducting tungsten meanders

“…The results of fitting and the measured resistivity data are plotted in the inset of figure 1(c). Equation (1), in general, is used to explain the resistivity behavior as a function of temperature for amorphous and disordered materials having negative temperature coefficient of resistivity [54], wherein the contribution from the second term -a aT is interpreted as due to scattering of electrons from two energy bands with different effective masses, while the third term…”